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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b35b968e72b5136bb9e2600688af43b61a7d00f69d40403ae5b0c1de528b8b' 
  AND token = 'bx2X8b+YCSlD/kBaFuZzNV5EJgaeGOVsOg7y4Xdb/1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}